all the Special Stages in Digimon

Armor an ancient form of digivolution which only a handful of Digimon are capable of. To gain this form, the Digimon needs to absorb the energy from one of the special Digi-Eggs. If a Digimon has multiple Digi-Eggs, its digivolved forms become progressively more powerful. An Armor Digimon's power is similar to that of a Champion/Adult's or lower. Two golden Digi-Eggs (of Miracles and Fate) exist, possessing power closer to that of an Ultimate/Perfect.

Hybrid-H, a form of digivolution used solely in Digimon Frontier where a human uses one of the Spirits of the Ancient Digimon. Their levels differ, depending on the type of spirit, or spirits, used, as well as the amounts.
Hybrid-H, the H standing for "Human". Shown only in Digimon Frontier, this is a form that transforms a human into a human-like Digimon, whose power rivals that of a Champion/Adult's. To attain this, one requires the H-Spirit of an ancient Digimon.

Hybrid-B, the B standing for "Beast". Shown only in Digimon Frontier, this is a form that transforms a human into a more bestial-looking Digimon, whose power rivals that of an Ultimate/Perfect's. To attain this, one requires the B-Spirit of an ancient Digimon. Most humans who acquire this seem to have difficulty controlling themselves after evolution however.

Hybrid-A, the A standing for "Advanced". Shown only in Digimon Frontier, this is a powerful form, achieved using both an H-Spirit and B-Spirit. In this form, Takuya was able to defeat a Mercurymon-transformed ShadowSeraphimon, though he was no match against other Mega level digimon such as Cherubimon or even his clone, thereby rendering this form of no use against most Megas.

Hybrid-Z, the Z standing for "Zeta". Shown only in Digimon Frontier, this form uses five H-Spirits and five B-Spirits, combining to give a human an incredibly advanced and powerful form. It's power is closer to that of a Mega/Ultimate.

Hybrid-U, The U stands for "Ultimate". Shown only in Digimon Frontier, this form's power is unrivaled. Only one known Digimon of this form exists, Susanoomon. He is formed when all spirits are unified.

Burst Mode: Shown so far only in Digimon Data Squad, Burst is "the power that exceeds Mega (Ultimate)", though it may just be similar to a mode change but not exactly the same where digimon of a certain level transform to attain greater power such as Imperialdramon. A Burst Digimon retains a similarity to their original form, but has new attacks and a clear increase in power and not only that but they are more powerful than a mega level, stronger than Imperialdramon's initial mode change.

Super Ultimate, a level even higher than Mega. Shown in manga V-Tamer and some NDS games, it has appeared in the anime series on certain occasions. Only a few Digimon are at this level, and sometimes they are just classified as Mega for convenience. However, in Digimon World DS, Daemon's Super Ultimate is referred to as a Super Mega Level. An example of Super Mega Digimon are Omnimon, Imperialdramon FM/PM, Malomyotismon and Gallantmon Crimson Mode, CV Angemon, Holy Lord Angemon, and so on.